08 yz 450 just stops running

hI IM NEW TO THE BOARD. I have an 08 yz 450. and it will run fine then just dies. it will not start back up but if you let it sit for a while example 1 hour or so. it will start right back up and run fine for a while then it does it again. its got fuel and spark any suggestions

keep it running faster maybe its too hot


Check your valve clearances.

Vapor lock?



Check it for spark right after it dies. Bet there isn't any.

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